Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-07
Scientific Reports 2, 221 (2012)
Physics
Condensed Matter
Superconductivity
6 figures, published version
Scientific paper
10.1038/srep00221
We report an in-plane optical spectroscopy study on the iron-selenide superconductor K$_{0.75}$Fe$_{1.75}$Se$_2$. The measurement revealed the development of a sharp reflectance edge below T$_c$ at frequency much smaller than the superconducting energy gap on a relatively incoherent electronic background, a phenomenon which was not seen in any other Fe-based superconductors so far investigated. Furthermore, the feature could be noticeably suppressed and shifted to lower frequency by a moderate magnetic field. Our analysis indicates that this edge structure arises from the development of a Josephson-coupling plasmon in the superconducting condensate. Together with the transmission electron microscopy analysis, our study yields compelling evidence for the presence of nanoscale phase separation between superconductivity and magnetism. The results also enable us to understand various seemingly controversial experimental data probed from different techniques.
Chen Guo-Feng
Dong Taihe
Hu Jiang-Ping
Li Jing-Qian
Song Yoo Jang
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